I mean... Perrin is a former gambler. Davo Sculdun is the richest of the thugs...

Sculdun was Perrins bookie, and since Perrin is alluded to not be wealthy, he was putting markers on Mon's tab like Edward Norton in Rounders. Mon probably found out when Sculdun tried to collect from Perrin and ended up having to settle with Mon.

Sculdun is mobbed up or has mob connections and handles their money was well, and that's the seed money for his fund. The fund he will slip Mon Mothma's rebellion contribution into so she can give it to Luthen.

Also, I understand Mon covering up what she's already done, but does she need to keep slipping money to Luthen? $100k/month seems minimal vs. $80 million from Aldhani.